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Display which distro is installed
Works on nearly all linux distros

calculate the total size of files in specified directory (in Megabytes)
the command will calculate the size of hidden files

copy from host1 to host2, through your host
This is a 'nocd' alternative :)

Kill any lingering ssh processes
Also ignoring "sshd" server is necessary since you should not kill ssh server processes.

scp a good script from host A which has no public access to host C, but with a hop by host B
middlehost allows ssh access from where you are but not securehost. Use nice ssh piping to simulate scp through A => B => C setting up the shell function if left as an exercise for the reader. ;-) Agent forwarding should avoid password typing.

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Download an Entire website with wget

Convert seconds to [DD:][HH:]MM:SS
Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

show the difference

seq (argc=2) for FreeBSD


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